1. Alumina Ceramic Crucible Cover is mainly made of alumina. 2. Alumina Ceramic Crucible Cover is fired at high temperature with a special formula. 3. Alumina Ceramic Crucible Cover is a refractory with high fire resistance. It can withstand temperatures of 1800 degrees Celsius and high temperature resistance. 4. Alumina Ceramic Crucible Cover is usually used for smelting precious metals, nickel And other metals, with excellent chemical resistance and high temperature resistance.